He said he was looking forward to battling for his place alongside players such as Paul Pogba, Bruno Fernandes, Nemanja Matic and Fred.
Chasing his 18th Grand Slam singles title, world number one Djokovic was in total control against his 28th-seeded opponent, winning 6-3, 6-3, 6-1 in one hour and 42 minutes to progress to the last 16 in the men's singles.
McLaren's Carlos Sainz finished a close second for his best ever finish, and the Racing Point of Lance Stroll took third to complete one of the most unlikely podiums in recent F1 history.
"I cannot begin to explain how incredible an opportunity it is to join a club with such an amazing history. I would like to thank everyone at Ajax, I grew up there and I will always have a special bond with the club. I am now ready to take the next step in my career and perform at the highest level and there is no higher standard than Manchester United," said Van de Beek on the Manchester United website.
The Austrian will now challenge 2014 champion Marin Cilic of Croatia in third round. Thiem has a 2-0 lead in their head-to-head series.
The organizers designed a route with a 17km climb before the finish line, which seemed like it might bring about some interesting developments on the rugged, narrow mountain road.
In the second half, Shanghai launched aggressive attack to pull one back, but their efforts turned out to be fruitless.
"We played well in the first half and created many chances, but we had difficulty after conceding the first goal," SIPG coach Vitor Pereira said.
Qingdao stormed to a 4-0 lead after they took victories in mixed doubles, men's singles, women's doubles and women's singles. However, men's doubles young pair Guo Ruohan and Shang Yichen defended some honor for Xiamen as they overcame a one game deficit to beat world champion Liu Yuchen and his partner Guo Junhao 9-11, 11-8, 11-9, 11-9 in the final dual.
"This victory is very important to me - I've worked so hard to get this win," said the 27-year-old Kazakh.
Sweden's star pole vaulter Armand Duplantis once again failed to beat Ukrainian legend Sergei Bubka's 26-year-old best outdoor mark of 6.14 meters, as the 20-year-old failed all his three attempts at 6.15m after clearing 6.00m. Enditem